Minecraft Java 1.21 Mods
Browse 5 free mods for Minecraft Java 1.21 — popular picks include Audaki Cart Engine: Faster Minecarts / Balanced for Survival / Vanilla Carts Improved, [SUC]Surival Useful Circuit生电全家桶, JoaCarpet.
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Audaki Cart Engine: Faster Minecarts / Balanced for Survival / Vanilla Carts Improved
🤩 Fast Minecart! Configurable Speed. Balanced for Vanilla/Survival. 100% glitch-free and compatible with all Redstone. Works high-speed with slopes/inclines/curves. Only vanilla track/carts needed. Can be added and removed at any time
[SUC]Surival Useful Circuit生电全家桶
生电全家桶 An advanced Minecraft survival redstone and automation modpack featuring Carpet and Masa mods.

JoaCarpet
A small carpet extension mod with useful features for redstone and storage tech (+some minor survival tweaks)
Simple Orbital Cannons
Circuit & Cartridge is a NeoForge 1.21.1 military simulation framework featuring advanced redstone, drones, orbital weapons, electronic warfare, and a public addon API, built for hardcore SMP and mil-sim servers.
Tiny Redstone Create Compat
Makes Tiny Redstone blocks compatible with Create trains and contraptions